Overview of Azure Load Balancer
When building software or computer systems in general, you may face a problem where a single instance of your server is just not enough. You may think about scaling that server up (that is, adding more compute power to it), but every machine has its physical limits. At some point, there’s no more possibility to go up – you need to balance the load across multiple machines.
Once you deploy more machines to handle the load, a new problem arises – you have the infrastructure necessary to receive incoming traffic, but how do you point each connection to the appropriate machine? If you think about it, multiple challenges need to be overcome in such a scenario: